Keeps HDMI Capture Card Device "open" So Loopback Audio Can See It amazon.com/dp/B0CGXFB716

HDMICaptureDeviceKeepOpen.go

package main

import (
	"fmt"
	"os"
	"os/exec"
	"os/signal"
	"syscall"
	"strconv"
	"strings"
	// "time"
	"gocv.io/x/gocv"
	"github.com/manifoldco/promptui"
)

func get_devices_mac_osx() ( result []string ) {
	swift_code := `import AVFoundation
import os
let stderr = FileHandle.standardError
let null_device = FileHandle( forUpdatingAtPath: "/dev/null" )!
dup2( null_device.fileDescriptor , stderr.fileDescriptor )
let discoverySession = AVCaptureDevice.DiscoverySession(
	deviceTypes: [.builtInWideAngleCamera, .external],
	mediaType: .video,
	position: .unspecified
)
let devices = discoverySession.devices
for ( index , device ) in devices.enumerated() {
	print( "\(index) === \(device.localizedName) === \(device.manufacturer)" )
}`
	cmd := exec.Command( "swift" , "-e" , swift_code )
	output , err := cmd.Output()
	if err != nil {
		fmt.Println( "Failed to execute Swift code:", err )
		return nil
	}
	result = strings.Split( strings.TrimSpace( string( output ) ) , "\n" )
	return
}

func main() {

	device_id := 0
	if len( os.Args ) > 1 {
		device_id , _ = strconv.Atoi( os.Args[1] )
	} else {
		devices := get_devices_mac_osx()
		prompt := promptui.Select{
			Label: "Select Device" ,
			Items: devices ,
		}
		device_id , _ , _ = prompt.Run()
	}

	webcam , err := gocv.OpenVideoCapture( device_id )
	if err != nil {
		fmt.Println( err )
		return
	}
	defer webcam.Close()
	fmt.Println( webcam )

	x_image := gocv.NewMat()
	defer x_image.Close()
	// go func() {
	// 	for {
	// 		webcam.Read( &x_image )
	// 	}
	// }()
	webcam.Read( &x_image )
	c := make( chan os.Signal )
	signal.Notify( c , os.Interrupt , syscall.SIGTERM )
	<-c
	fmt.Println( "Shutting Down..." )
	// gocv.IMWrite( "test.png" , x_image )
}